To make bronze in color; to give something a bronze-like appearance or to coat with bronze.
From the prefix 'em-' (to cause to be) plus 'bronze' (the metal/color). This is a relatively rare or archaic verb following standard English word-formation patterns.
This verb is so rare that most modern dictionaries don't include it—it's the kind of word Victorian writers might invent on the fly using standard word-building rules, then abandon when it didn't catch on.
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